> Now wash your hands!
Your Apple Watch can help you in a COVID–19 world. Its handwashing timer (Settings > Handwashing) detects running water and hand movement and then counts down for the recommended 20 seconds; the Series 6’s built–in blood oxygen sensor can warn you if your blood isn’t saturated enough, a telltale sign of respiratory problems; and the Series 3 onwards can still unlock your Face ID iPhone when you’re masked if wrist detection and passcode protection are on.